Delayed notifications on Samsung only.

My set up includes,,,, Doorbell pro, 2 stick up cams , 2 chimes, 1 chime pro, plus Amazon Echo dot, and 2 Echo shows. and 1 Huawei P smart phone, 1 PC, 1 Samsung S4 tablet and 1 recently bought Samsung A21s phone. All devices are working as they should as far as event notifications are concerend, except for the Samsung phone and tablet. Usually the motion/Ring notifications from cameras/ doorbell are instant ( or within 1/ 2 seconds) on the PC, the Huawei , the dot, all the chimes, and both echo shows,... no problem. However,,, The samsung tablet and phone are more often than not, late, could be 10 seconds late, could be 30 seconds,,,,but always late, and always only on the Samsung devices. So,,, trying to figure out why only Samsung devices are late ?. Any ideas greatly appreciated. Thanks. I do have another problem with just the A21s not downloading the RING alert tones with the app, ( Only Samsung tones available to choose from )... which I will post seperately.